/***********************************************
 This file is part of redia-library-app-ios.
 
 Copyright (c) 2012, 2013 Redia A/S
 
 Redia-library-app-ios is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 Redia-library-app-ios is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with redia-library-app-ios.  If not, see <http://www.gnu.org/licenses/>.
 
 *********************************************** */


#import "LazyLoadImage.h"
#import "UrlCacheManager.h"
#import "defines.h"

@implementation LazyLoadImage

@synthesize fImage;
@synthesize fOriginalURL;

- (id)init
{
	self = [super init];
	if (self!=nil) {
		fIsLoaded = false;
		fIsLoading = false;
		self.fImage = nil;
		cacheEntry = nil;
	}
	return self;
	
}

//for compatibility.
- (void)setUrl:(NSURL*)url 
{
	self.fOriginalURL = url;
}


- (void)loadImageWithDelegate:(id<ImageLoadedNotificationDelegate>)delegate
{
	fDelegate=delegate;
	 //keep reference retained
	if (fIsLoaded) {
		[fDelegate imageLoaded:fImage];
	} else if (!fIsLoading) {
		fIsLoading=true;
		NSAssert(fOriginalURL!=nil, @"No URL specified");
		cacheEntry = [[UrlCacheManager instance] loadUrl:fOriginalURL delegate:self];
	}
}

- (void)unloadImage 
{
	if (fIsLoading) {
		fIsLoading=false;
		if (cacheEntry!=nil) {
			[cacheEntry cancelRequest];
			cacheEntry=nil;
		}
		DLog(@"cancelling download");
		
	}
	if (fDelegate!=nil) {
		fDelegate=nil;
	}
	
	fIsLoaded = NO;
	/* done automatically via property retain attribute
	if (fImage!=nil) {
		[fImage release];
	}
	 */
	if (fImage!=nil) {
		DLog(@"purging one image");
	}
	self.fImage=nil; //released by property
	
}

- (BOOL)isLoadedOrLoading
{
	return fIsLoaded || fIsLoading;
}


- (void)imageLoaded:(UIImage*)theImage {
	NSAssert(theImage!=nil,@"image loaded but nil image returned");
	fIsLoaded = YES;
	fIsLoading = false;
	self.fImage = theImage;
	[fDelegate imageLoaded:fImage];
	cacheEntry=nil;
	fDelegate=nil;
}

- (void)loadImageError 
{
	if (fIsLoading) {
		fIsLoading=false;
		if (!fIsLoaded) {
			[fDelegate loadImageError];
		}
	}
	if (cacheEntry!=nil) {
		cacheEntry=nil;
	}
	fDelegate=nil;
}

/*
- (void) dealloc
{
	DLog(@"dealloced");
}
*/

@end
